Si7386DP_RC Vishay Siliconix R-C Thermal Model Parameters DESCRIPTION The parametric values in the R-C thermal model have been derived using curve-fitting techniques. These techniques are described in "A Simple Method of Generating Thermal Models for a Power MOSFET"[1]. When implemented in P-Spice, these values have matching characteristic curves to the Single Pulse Transient Thermal Impedance curves for the MOSFET. R-C values for the electrical circuit in the Foster/Tank configuration are included. The corresponding values for the Cauer/Filter configuration are available upon request. Note: For a detailed explanation of implementing these values in P-SPICE, refer to Application Note AN609 Thermal Simulations Of Power MOSFETs on P-SPICE Platform. R-C THERMAL MODEL FOR TANK CONFIGURATION R-C VALUES FOR TANK CONFIGURATION Thermal Resistance (°C/W) Case Foot 3.7869 23.4650 m N/A 7.8648 635.6399 m N/A RT3 7.4921 1.5584 N/A RT4 50.5690 766.4544 m N/A Junction to Ambient Case Foot CT1 3.7411 m 1.3632 m N/A CT2 394.2996 m 967.1048 u N/A CT3 55.7379 m 6.7787 m N/A CT4 1.3203 6.3392 m N/A Junction to Ambient RT1 RT2 Thermal Capacitance (Joules/°C) This document is intended as a SPICE modeling guideline and does not constitute a commercial product data sheet. Designers should refer to the appropriate data sheet of the same number for guaranteed specification limits. Document Number: 73733 Revision 16-Jan-06 www.vishay.com 1 Si7386DP_RC Vishay Siliconix R-C THERMAL MODEL FOR FILTER CONFIGURATION R-C VALUES FOR FILTER CONFIGURATION Thermal Resistance (°C/W) Foot Junction to Ambient Case RF1 3.2518 68.6442 u N/A RF2 11.4514 1.0326 N/A RF3 13.5809 1.1145 N/A RF4 41.7249 857.0875 m N/A Thermal Capacitance (Joules/°C) Junction to Ambient Case Foot CF1 1.8961 m 366.9012 u N/A CF2 36.7553 m 290.1119 u N/A CF3 483.1418 m 3.7823 m N/A CF4 1.0578 728.0509 u N/A Note: NA indicates not applicable Reference: [1] "A Simple Method of Generating Thermal Models for a Power MOSFET" by Wharton McDaniel and Kandarp Pandya, IEEE / SEMITHERM 2002 www.vishay.com 2 Document Number: 73733 Revision 16-Jan-06 Si7386DP_RC Vishay Siliconix Document Number: 73733 Revision 16-Jan-06 www.vishay.com 3